Affectionately called the "Peashooter," the Boeing P-26 was America's first all-metal, low-wing fighter. It was also the last fighter with an open cockpit, fixed landing gear, and wire-braced wings. First flown in 1932, the P-26 was the U.S. Army Air Corps' primary fighter in the mid-1930s and was used to help protect China and the Philippines during World War II.